You do have an angle finder of some sort I hope . If so what are your driveshaft and pinion angles ? If you don't you can get one good enough at Lowes or Homo Depot . It is one very handy tool if you monkey with the suspension much at all and they are cheap . set your pinion about a degree or a degree and a half less than your driveshaft and you should have no vibes , same with the front end .
05 TJ Rubicon 4.88s ,3&2" BDS, 1.25" JKS BL, Bilstein 5100, Currie Currectlync , Savvy arms/Metalcloak Duroflex joints and JJs lower front, 33"Cooper STT's, Mc front Track Bar
2012 JK Sahara AEV 2.5" w/Geo bracket , Currie lower front control arms, Synergy draglink, Teraflex trackbar ,Bilstein 5100 ,35"KO2s ,AEV Pintlers